90gtus

Hello 7s,
I have a 1990 GTUs(FC3S) and it needs some works.
In search of a new clutch master cylinder, I came across www.mazdasurplus.com and found a clutch master cylinder for a 1993 RX7(FD3S).

Bendix 12685 1 Clutch Master Cylinder 1993 Mazda RX-7 $15

Will this work for my application? or are they different?
Should I find FC3S specific cluch master cylinder?

Thanks in advance,
Dais

cymfc3s

Completely different system. The FD master cylinder shares the brake master reservoir. And the clutch system is a pull type, so none of the stuff interchanges with a 2nd gen.

KKMpunkrock2011

iTrader: (5)

OOOOOOOOOOOOOOLD bump, wondering if the above answer is still the correct answer, as I assume it is due to the technical information provided.

Turbo II Rotor

iTrader: (2)

No it changed, all fd stuff works in fc's now.

KKMpunkrock2011

iTrader: (5)

wrong color, sarcasm is supposed to be yellow.

arghx

iTrader: (3)

FD clutch system is completely different from FC. slave cylinder mounts in a different way as well.

KKMpunkrock2011

iTrader: (5)

that's what I figured based on the post from cymfc3s, but I haven't messed around with mine on my FD or the one on my friends FC so I had nothing to reference and I'm at work and he's in class so this is my only reference at the moment. At least I bumped an old thread via searching. And it never hurts to ask, thanks argh.

Turbo II Rotor

iTrader: (2)

You're 0 for 2 in this thread. Sarcasm is teal.

lams09

my friend that has an FD says you can but idk. what cymfc3s sayd it's completely different,.

arghx

iTrader: (3)

Here's why it won't work.

clokker

iTrader: (2)

Great pic but it has zip to do with the master cylinder.

The FC clutch cylinder has studs located at 12 and 6 o'clock, the FD has studs at @2 and 7 o'clock.
The FC has an integrated reservoir, the FD has no reservoir and shares fluid with the brake master.

They both use the same rebuild kit, so are apparently the same size.
This means that, assuming the stud to stud distance is equal- and I don't know if it is, you could use the FD unit if you added a remote reservoir to feed it.
Many Hondas use such a reservoir, so it'd be easy to source.

I don't recall the outlet port location/orientation on the FD MC, but it's likely you'd have to tweak the hardline to line up properly.

Seems like a lot of work to save a few bucks but it probably could be done if you wanted.

funklove

Sorry for the necroposting)
I used FD master with FC slave during cosmo AT to manual conversion. I used FD clutch pedal also. Seems to be working, but I have troubles with gear select during driving. It might be a hydraulic issue with the clutch.

gxl90rx7

iTrader: (1)

i have the same problem.. im using FD master and clutch pedal, with FC slave, and the clutch doesnt release until pedal is at the floor. i found out the hydraulics are all the same diameter, the difference is in the leverage of the pedal. The FC pedal must have more leverage, so when you use FD pedal with FC push-style clutch, you dont get as much movement at the clutch. the FD pull-style clutch probably doesnt need as much movement to release compared to FC

funklove

Did you try to set the long push rod?
My clutch release is about 2/3 of the pedal stroke. And car well starts at 1/2, may be less.
I hear the primary shaft of the gearbox stops (bad bearing), but it is too hard to shift anyway even the engine is stopped. A bad transmission is as.

gxl90rx7

iTrader: (1)

have not tried that, but i did adjust the pedal rod all the way out, so that it pushes further into the master cylinder and it helped. it is drivable now

funklove

Thank you! I'll try to do the same.